"And that's why I go back to saying that at the end of the day this is all about the Constitution. … If it went to court, that would be the question that the courts would be addressing. Someone can make an allegation of obstruction, those are Article II powers and a very compelling case."

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Sekulow's comments come as the president escalates his attack on Mueller's probe into possible collusion between the Trump campaign and Russia.

"This is a terrible situation and Attorney General Jeff Sessions should stop this Rigged Witch Hunt right now, before it continues to stain our country any further. Bob Mueller is totally conflicted, and his 17 Angry Democrats that are doing his dirty work are a disgrace to USA!" Trump tweeted last Wednesday, prompting questions over whether he was issuing a direct order to Sessions or merely stating his "opinion."

White House press secretary Sarah Huckabee Sanders later sought to dismiss concerns that the president's tweet should be taken as a directive.

"It's not an order. It's the president's opinion," Sanders told reporters during a press briefing later that day. "The president is not obstructing. He is fighting back," she added.

Both Sekulow and Trump attorney Rudy Giuliani had previously told The Washington Post that the president "uses tweets to express his opinion."

Trump's legal team is deciding whether Trump should sit down with Mueller for an interview as part of his investigation, though the team has said it would only sit if Mueller agreed to rule out questions about obstruction of justice.

Sekulow said Sunday that the legal team's "inclination" is for Trump not to sit down for an interview.